Resistors
High Voltage
High Voltage
Resistors
Thick Film
Thick Film Resistors
Welwyn Components
VRW Series
VRW Series
meets the requirements of BS / EN /
•
VRW37
IEC 60065
VRW37 meets requirements of BS / EN / IEC 60065
•
High
working voltage to 10kV
10kV in compact
High
working voltage to
in compact size
size
High ohmic range to 68M
•
High ohmic range to 68M
High pulse load capability
•
High pulse load capability
Robust flameproof coating material
•
Robust flameproof coating material
Surface mount ZI-form option
•
RoHS compliant
All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
Electrical Data
VRW25
Power rating at 70˚ C
Resistance range
Limiting element voltage
Isolation voltage
TCR
Resistance Tolerance
Standard Values
Thermal Impedance
Ambient temperature range
˚ C/watt
˚C
140
watts
(Ohms)
volts dc or ac peak
volts
ppm/˚ C
%
0.25
100K to 30M
1600
VRW37
0.5
100K to 30M
3500
700
200
1, 2, 5
E24 or E96
112
-55 to +155˚ C
70
VRW68
1.0
100K to 68M
10000
Physical Data
Type
L
Max
6.2
9.0
15.5
(Dimensions (mm) & Weight (g)
f
min
21
19.6
27
d
Nom
0.6±0.05
0.8±0.05
0.8±0.05
PCB
mount
centres
10.2
12.7
20.3
Min
bend
radius
0.6
1.2
1.2
Wt.
nom
0.3
0.5
1.15
d
D
Max
2.5
3.7
5.0
VRW25
VRW37
VRW68
D
L
f
Construction
Resistive thick film material is applied to high-grade ceramic
rods. Tin-plated steel caps are force fitted and the
termination wires are welded to the caps. The value is
obtained by a helical cut in the film and finally the resistor
body is protected by a cement coating.
Terminations
Material:
Strength:
Solderability:
Hot tin dipped copper wire
The terminations meet the requirements
of IEC 68.2.21
The terminations meet the requirements
of IEC 115-1 Clause 4.17.3.2
Marking
1% tolerance resistors are colour coded with 5 bands. 2%
and 5% tolerance have 4 bands. IEC62 colours are used.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Flammability
The resistor coating will not burn under any condition of
applied temperature or power overload.
General Note
General Note
TT Electronics reserves the right to make changes in product specification without notice
without notice or liability.
Welwyn Components reserves the right to make changes in product specification
or liability.
All information is
is subject to Welwyn’s own data and is considered
accurate at time of going to
to print.
All information
subject to TT Electronics’ own data and is considered
accurate at time of going
print.
BI Technologies IRC Welwyn
A subsidiary of
www.ttelectronics.com/resistors
TT electronics plc
Issue C ·
05.08
07.06
06.18
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
© TT Electronics plc
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
VRW
SQP
Series
VRW Series
SQP
VRW Series
High Voltage
High Voltage
High Voltage
High Voltage
Resistors
High Film
Thick Film Resistors
Thick Voltage
Thick Film Resistors
Thick Film Resistors
Thick Film Resistors
SQP
VRW Series
SQP
VRW Series
Performance Data
Performance Data
Performance Data
Performance Data
Load at rated voltage (1000hrs at 70˚C)
Load at rated voltage (1000hrs at 70˚C)
Dera n rated rated p ower at 0 C
n from rated
Loadtatg fromvoltagep(1000hrs7at˚˚ C
Dera tiiatgrated voltage ower at 70 70˚C)
Load
(1000hrs at 70˚C)
Overload (10 xxa5sat 6.25exxPr 7notexceeding 2 2 x LEV) 10kV in air)
Overload r(10 r5s d 6.25 r aPrnot exceeding x LEV or
(10 5s at ow
Pr 0˚
Derating f(10 xx5seat p6.25xxPr not Cexceeding22x x LEV) 10kV in air)
om t at 6.25 t not exceeding LEV or
Overload from rated power at 70˚ C
Overload
Derating
Damp heat steady at 6.25 xPr not40˚C, 90% x LEV)
steady
days, exceeding x LEV
Overload (10 xx5s at 6.25(56 Prnot exceeding 22 RH) or 10kV in air)
Overload (10 5s state
Damp heat(10xx5s at 6.25xxxPr not 40˚C, 90%2RH) or 10kV in air)
Overload (10 5s state (56 days, exceeding 2 x x LEV)
Overload
at 6.25 Pr not exceeding LEV
Climatic sequence
Damp heat steady state (56 days, 40˚C, 90% RH)
Climatic sequence state (56 days, 40˚C, 90% RH)
Damp heat steady
Climatic sequence
Climatic category
Climatic category
Climatic sequence
Temperature rapid change
Climatic category change
Temperature rapid
Climatic category
Resistance to solder heat
solder heat
Temperature rapid change
Resistance to rapid change
Temperature
Vibration
Resistance to solder heat
Vibration to solder heat
Resistance
Volltage P roof
VibrationProof
V o tage
Vibration
Voltage Proof
Voltage Proof
1
00
1
00
Welwyn Components
Welwyn Components
Welwyn Components
Welwyn Components
Pulse Performace
Performace
Pulse
Performance
Performance
Pulse
Pulse Performace
Pulse Performace
Pulse Performance
Pulse Performance
Vmax (kV)
Vmax (kV)
Vmax
Vmax (kV) (kV)
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
vR%
ollts
ts
vo %
R
volts
volts
Max mum
Maxiimum
1
mu
5*
Maxi
..5*
m
Ma
1
imum
x
1.5*
1.5*
1
2
1
2
1..5
1
125
1
2
15
1...5
1 .5
15
1.5
1.5
0..5
05
05
0...5
0 .5
05
0...5
05
0 .5
05
0.5
0.5
Typ ca
Typiicall
04
Ty
0.
i
4
al
p
.
c
Typical
zero at 155 C
0.4
zero at 155˚˚ C
0.4
0..15
zero at 155˚ C
0 15
zero at 155˚ C
0.1
0011
. 5
0..15
02
0...1
0 .2
01
55/155/56
0.2
55/155/56
0.2
0..05
55/155/56
0 05
55/155/56
0 05
0...05
0 .05
0 05
0...05
0 05
0 .05
0 05
700 miin
00 m n
0.05
7
0.05
* 2% for ohmic values above 24M
70* 2% for ohmic values above 24M
0 min
700 min
* 2% for ohmic values above 24M
* 2% for ohmic values above 24M
1
00
1
00
VRW25
VRW25
VRW37
VRW37
VRW25
VRW25
VRW68
VRW68
VRW37
VRW37
VRW68
VRW68
1
0
1
0
1
0
1
0
0.1
1 0.1
1
0.1
0.1
1
1
Maximum peak voltage in accordance with “IEC 60065 chapter 14.1”
Maximum peak voltage in accordance with “IEC 60065 chapter 14.1”
50 discharges from a 1nF accordance with to V max. 12 discharges/minute.
to V max.
Maximum peak voltage in capacitor charged“IEC 6006512 discharges/minute.
50 discharges from a 1nF capacitor charged“IEC 60065 chapter 14.1”
Maximum peak voltage in accordance with
chapter 14.1”
50 discharges from a 1nF capacitor charged to V max. 12 discharges/minute.
50 discharges from a 1nF capacitor charged to V max. 12 discharges/minute.
1
1
0
Value (megohms)
Value (megohms)
1
1
0
Value (megohms)
Value (megohms)
1
1
1
0
1
0
1
00
1
00
1
00
1
00
Application Notes
Application Notes
Application Notes
limits imposed by some PCB materials, derating may be necessary. An
1. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. An
Application
temperature
1. Due to operating
Notes
estimate operating temperature limits imposed at the center of the body can be calculated using the
calculated using the
1. Due toof the temperature rise to be expected by the center materials, derating may be necessary. An
estimate of the temperature rise to be expected at some PCB of the body can be may be necessary. An
1. Due to operatingfigures given under imposed by some PCB materials, derating
temperature limits Electrical Data.
thermal of the temperature rise under Electrical Data.
estimate impedance figures given to be expected at the center of the body can be calculated using the
thermal impedance
estimate of the temperature rise to be expected at the center of the body can be calculated using the
thermal impedance figures given underradial, goalpost or lancet pre-formed leads. The VRW37 is also
2. VRW resistors can be supplied with Electrical Data.
thermal impedance be supplied under Electrical Data.
2. VRW resistors canfigures given with radial, goalpost or lancet pre-formed leads. The VRW37 is also
available in ZI-form SMD format with radial, goalpost -
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
in ZI-form SMD format
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
2. VRW resistors can be suppliedpacked in blister tape -or lancet pre-formed leads. The VRW37 is also
availableresistors can be suppliedpacked in blister tape or lancet pre-formed leads. The VRW37 is also
2. VRW
with radial, goalpost
available in ZI-form SMD format packed in blister tape --
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
available in ZI-form SMD format packed in blister tape
see http://www.ttelectronics.com/themes/ttelectronics/datasheets/resistors/ZI-form.pdf
boxed. The critical dimensions are shown and
shown
Our standard packaging for VRW is taped in
boxed. The critical dimensions are is tapedin
Our standard componentfor VRW not
packaging wires will
and
Figure The critical dimensions will not
boxed. 1. The component wiresare shown in
Figure 1. The
boxed. The critical dimensions are
protrude beyond the outside edge shown in
Figure 1. The component wires willof the
protrude beyond the outside edge of the
Figure Alternative packaging is available by
1. The component wires will not
not
tapes.
protrude beyond the outside is available by
tapes. Alternative the outside edge of the
packaging edge of the
protrude beyond
request. Pre-formed resistors are supplied
tapes. Alternative packaging is available by
request. Pre-formed resistors are suppliedby
tapes. Alternative packaging is available
loose packed in plastic bags are supplied
request. Pre-formed resistors or boxes.
loose packed in plastic bags or boxes.
request. Pre-formed resistors are supplied
loose packed in plastic bags or boxes.
loose packed in plastic bags or boxes.
Packaging
Packaging
Packaging
Our standard packaging for VRW is taped and
Packaging
Our standard packaging for VRW is taped and
Type
Type
VRW25/37
Type
VRW25/37
Type
VRW68
VRW25/37
VRW68
VRW25/37
VRW68
VRW68
b
b
52 ±2mm
b
52 ±2mm
b
73 ±2mm
52 ±2mm
73 ±2mm
52 ±2mm
73 ±2mm
73 ±2mm
c
c
5 ±0.5mm
c
5 ±0.5mm
c
10 ±0.5mm
5 ±0.5mm
10 ±0.5mm
5 ±0.5mm
10 ±0.5mm
10 ±0.5mm
c
c
c
c
f1
f1
6
6
mm
mm
6
6
mm
mm
f1
f1
f2
f2
Body location f1-f2 1.4mm
Body location f1-f2 1.4mm
b
b
Body location f1-f2
Body location f1-f2
b
b
f2
f2
1.4mm
1.4mm
6
6
mm
mm
6
6
mm
mm
General Note
TT
Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
©
Electronics reserves the right to make changes in product specification without notice or liability.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
BI Technologies IRC Welwyn
05.08
www.ttelectronics.com/resistors
05.08
05.08
06.18
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT Electronics plc
822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Telephone: +44 (0) 1670
All information is subject to TT Electronics’ own
+44 (0)
is considered accurate
info@welwyn-tt.com ·
Telephone: +44 (0) 1670 822181 · Facsimile:
data and
1670 829465 · Email:
at time of going to print.
Website: www.welwyn-tt.com
05.08
71
71
71
71
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